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74HC5555 View Datasheet(PDF) - NXP Semiconductors.

Part NameDescriptionManufacturer
74HC5555 Programmable delay timer with oscillator NXP
NXP Semiconductors. NXP
74HC5555 Datasheet PDF : 23 Pages
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Philips Semiconductors
Programmable delay timer with oscillator
Product specification
74HC/HCT5555
FEATURES
Positive and negative edge
triggered
Retriggerable or non-retriggerable
Programmable delay
minimum: 100 ns
maximum: depends on input
frequency and division ratio
Divide-by range of 2 to 224
Direct reset terminates output
pulse
Very low power consumption in
triggered start mode
3 oscillator operating modes:
– RC oscillator
– Crystal oscillator
– External oscillator
Device is unaffected by variations
in temperature and VCC when using
an external oscillator
Automatic power-ON reset
Schmitt trigger action on both
trigger inputs
Direct drive for a power transistor
Low power consumption in active
mode with respect to TTL type
timers
High precision due to digital timing
Output capability: 20 mA
ICC category: MSI.
APPLICATIONS
Motor control
Attic fan timers
Delay circuits
Automotive applications
Precision timing
Domestic appliances.
GENERAL DESCRIPTION
The 74HC/HCT5555 are high-speed
Si-gate CMOS devices and are pin
compatible with low power Schottky
TTL (LSTTL). They are specified in
compliance with JEDEC standard
no. 7A.
The 74HC/HCT5555 are precision
programmable delay timers which
consist of:
24-stage binary counter
integrated oscillator (using external
timing components)
retriggerable/non-retriggerable
monostable
automatic power-ON reset
output control logic
oscillator control logic
overriding asynchronous master
reset (MR).
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns.
SYMBOL
PARAMETER
CONDITIONS
tPHL/tPLH
CI
CPD
propagation delay
A, B to Q/Q
MR to Q/Q
RS to Q/Q
input capacitance
power dissipation
capacitance per buffer
CL = 15 pF;
VCC = 5 V
notes 1 and 2
TYP. UNIT
24 24 ns
19 20 ns
26 28 ns
3.5 3.5 pF
23 36 pF
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD x VCC2 x fi + Σ(CL x VCC2 x fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
Σ(CL x VCC2 x fo) = sum of outputs.
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC 1.5 V.
ORDERING INFORMATION
EXTENDED TYPE
NUMBER
74HC/HCT5555N
74HC/HCT5555D
PINS
16
16
PACKAGE
PIN POSITION MATERIAL
DIL
SO16
plastic
plastic
CODE
SOT38Z
SOT109A
September 1993
2
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